fix: 似乎从2021.06.14开始的编译, 都与rtt的最新代码不兼容, 那么尝试固定为rtt v4.0.3

.github/workflows/air100st.yml

@@ -28,6 +28,8 @@ jobs:
     - name: clone rtt
       run: |
         git clone https://github.com/RT-Thread/rt-thread.git ~/work/action/rt-thread
+        cd ~/work/action/rt-thread
+        git clone v4.0.3
     - name: prepare packages
       run: |
         cd bsp/air100st/rtt

.github/workflows/air640w.yml

@@ -28,6 +28,8 @@ jobs:
     - name: clone rtt
       run: |
         git clone https://github.com/RT-Thread/rt-thread.git ~/work/action/rt-thread
+        cd ~/work/action/rt-thread
+        git clone v4.0.3
     - name: prepare packages
       run: |
         cd bsp/air640w/rtt